Hanger for concrete ceilings



E. T. MARTIN. HANGER FOR CONCRETE CEILINGS. APPLICATION FILED AuG.28. I9I9.

risica. s

EUGENE T. MAR-TIN, OF CHICAGO, ILLINOIS.

HANGER FR CONCRETE CEILINGS.

Speecaton of Letters Patent. patented Allg. 31, 1920 Application filed August 28, 1919. Serial No. 320,343.

To all wlw/nt t may concern.' u

Be it known that I, EUGENE T. MARTIN, a citizen of the United States, residing at Chicago,\in the county of Cook and State of Illinois,liave invented certain new and useful Improvements in Hangers for Concrete Ceilings; and I do hei'eby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the'art to which it appertains to make and use the same.

This invention has for its object to provide a hangei'for concrete ceilings, constituting more particularly a. bolt socket adapted to be embedded in the concrete ceiling for subsequently suspending shafting-hangn ers and motors and the like from such ceiling. i

The main object of the present invention is to provide a hanger of the character defined, which is adapted to receive a bolt the lower end of which rests upon the bottom of the mold of the ceiling at the time of pouring the same and which, when the mold is removed, will of its own weight 4project from the lower end of the socket of the hanger so that the location of the hangers can be plainly discerned after the ceiling has been plastered.

A further object of the invention is to provide a device of the character defined, wherein sufficient weight is imparted to the bolt to cause the same tol readily project itself by gravity through a coating of fresh plaster applied to the ceiling after the m'ol'd thereof has been removed if the plasterer should unintentionally push the bolt up within the socket when applying the plaster.

Another object of the inventionis to' provide a hanger of the character defined, wherein the bolt is veiy firmly and rigidly held in position for use without, however, constituting any parts of the device of such exact dimensions as would render them inoperative or diiiicult of operation in the event of rust or corrosion of contacting surfaces and which will not require any niachine finishing.l

Other objects of the invention will be nii-. derstood from the .following specification:

rlhe invention consists of the features of construction and combinations of parts here,l inafter fully described and particularly claimed:

In the accompanying drawings, illustrating suitable embodiment of the invention7 Figure l is an end elevation of a hanger socket constructed in accordance with the invention, showing the same embedded in a concrete ceiling.

Fig. 2 is a central longitudinal section on the line 2-2 of Fig. l, the bottom of the mold for the ceiling being indicated.

Fig. 3 is an inverted plan View of the hanger.

Fig. 4- is a horizontal section of the same on line 4 4 of Fig. 2.

Fig. 5 is a detail perspective view of the block constituting a part of the device.

Fig. 6 is a sectional view of an interlocking forni of cover;

Fig. 7 is a perspective view of another form of interlocking cover.y

The said hanger comprises a socket A preferably made of cast iron or the like, which is rectangular in horizontal section and has parallel side walls and tapering end walls, the latter converging toward the bottom of the socket. In the bottom of the latter, centrally thereof, i. e., equidistant from the corners, is an opening Bthrough which the shank of the bolt C is adapted to project, said opening being of somewhat larger diameter than that of the bolt for reasons which will be hereinafter more fully pointed out.

lVithin the socket there is disposed a block D of cast iron having parallel side faces and tapering end faces, the taper of the latter being substantially coincident with that of the end walls of the socket. The width of the block between its parallel side faces is substantially equal to the inner width of the socket between the side walls thereof. All four ofthe faces of the block D are provided with longitudinal grooves E which serve to render` the same somewhat lighter and will cause the same to be more readily and snugly fitted into the socket ik Said blockuD7 is reciprocable in the socket from the upper end thereof to that point neary the lower end thereof at which the tapering end walls thereof firmly engage the tapering end walls of the socket, thetwo positions being shown in full and dotted lines, respectively, in Fig. 2. The said block D is provided with a central threaded vopening which may extend partially or entirely through the same to receive the threaded upper end portion of the bolt C of which it may be said to constitute the head.

Extending outwardly from the parallel side walls of the socketV A are two flanges F each of which is provided witlra iper foration for the passage of a nail by means of which the socket is secured to the mold to hold it firmly in positionV whileA casting the ceiling.

The end walls of the socket A are provided at their upper' end portions with parwardly extending ribs or Aprojections K which serve to engage in the concretefor more firmly holding the socket in place therein. Y

llhe block D being relatively heavy and adding its weight to the bolt C will obviously cause the latter to falll byvgravity to project the bolt C from the socket when the mold is removedl and it is heavy enough Vto force itsy way by gravity through an ordinary layer of plaster applied tothe ceiling after the moldis removed, should it occur that the plastcrer lifts thebolt up into the socket when applying the plaster.

' In order to prevent the possibility of little particles of plaster, which may lind' their way between the bolt C and the inner face of the opening B from preventing the fall* by gravity of the bolt through and to penetrate the layerof plaster, the opening B 1s made relatively large in diameter. lt is also made large for the purpose of permitting the shank of the bolt C to be slightly flexed ltoV extend truly in the desired direction from the ceiling, it being obvious that molds for such structures are not apt to be absolutely accurate as to level rof all sur- By` allowing play in thexopening B lthe bolt C may be positioned as desire'd whenv suspending hangers, motorsand the like from the ceiling. rThe bolt C and block cD are of a combined length Vequal y en to the total-length of the Vsocket A so that when the Vlatter is positioned `inthe mold, said bolt will be completely housed in the Vsocket without,l however', interfering' with thecover J thereof and being as a whole Y as long as the socket it cannot be retained inthe socket against the action of gravity.

Alifter thel mold is removed andthe bolt C moved'downwardly to its normal Vposition, the block D will become wedged very firmly in place in the socket Af thus preventing lost motion relativelyto the vlatter from the invention as defined in .and obviously it `can be replaced by a longer bolt or by any suitable hanging device for specified purposes such as pipe hangers' or eye-bolts. 4

The device may also be employed advantageously in verticalV walls. When so used Va light helical compressionspring L will be introduced between the block D and the cover d and Vmeans such as a wire or sheet metal yoke M used to hold the cover in place against the action of the spring. ln place of the yoke l1/l the cover may consist of aV tleshaped strip N ofsheetinetal having its end' flanges D channeled Vas at 1) to receive the end flanges K of the housing and which is adaptedV to be slidlinto place from one side of'said housing.

.The total length of the movable device is such that the lower end of the'bolt cannot rise high .enough .within the socket Vto rest upon the upper surface of the bottom wall of the socket andthus be retained therein. ln the form shown some of this length is made up by the spring D but it isobvious that when thespring is not used the boltJ itself can be long enough to prevent it disappearing within the socket.` This isto insureV the' dropping down .of the bolt immediately the form is removed.VK

lWh'ile l have shown the 'preferred Yembodpiment of the invention in the accompanying Y drawing, it will be understood, of course,Y

that such embodiment Y may Vbev changed *andv varied in details of construction'as mechanical skill and the needs of any particular installation may require without departing the appended claims. Y

l claim as my invention:

r.1. ln a device of the kind described, a socket adapted to be embedded'in concrete, one wall-thereof flush with an outer face of the concrete, the socket having a space with'- in same eXtendingaway from the face Vof the concrete,l a block movabl'evin said space Y from and toward said face, means preventing the removalof the block from the socket, a bolt having 4threaded. engagement with the block, the overall: length ofthe block and bolt being substantially thedepth of said spaceV from saidv face4 to permit the bolt to be 'pushed withinl the space and have its outer endV rest in contact with .the form against which saidface of the concrete is to'be formed. Y Y

2. In a device of the kind d'c-iscribed,` a socket to be embedded in concrete with one wallv flush with an outer face ofthe vconcrete, means for retaining the socket against removal from the concrete, the socket .being closed by a wall; at its outer end provided with abolt hole, a bolt'eftending through said hole into the socket, a block held in the socket against rotation and movable in the socket from and toward the face of the concrete, the combined length of the bolt and the block being substantially the depth of the socket from the face of the concrete, permitting the bolt to be lifted into the socket with its free end adapted-to rest on the mold upon which the concrete is to be formed, the bolt being free to drop by gravity with its free end extending beyond the face of the concrete when the mold is removed.

3. In a device of the kind described, a socket adapted to bc embedded in concrete, and having a Wall adapted to be flush with an outer face of the concrete, said Wall having a perforation through which a bolt can be inserted into the socket, a threaded meinber in the socket, means for preventing the rotation of said member, said member being free to be moved from and toward said perforatcal wall of the socket, a bolt for enn gagement in said threaded opening, the bolt and block being adapted to be lifted up so that the free end of the bolt Will rest on the mold upon which the concrete is to be formed, and being adapted to drop freely when the mold is removed, the perforated ivall preventing the removal of the threaded member from the socket.

4f. In a device of the kind described, a socket adapted to be embedded in concrete and having a Wall adapted to be flush with an outer face of the concrete, said Wall having a perforation through which a bolt can be inserted into the socket, a member Within the socket provided with a threaded opening for receivinga bolt, the socket member having inclined Walls Which are closer together at their lower ends than at their up per ends and the cooperating Walls of the threaded member being correspondingly inclined, the member being of such dimension that it Wedgingly engages the inclined Walls of the socket before it contacts With the per forated Wall thereof, the total length of the bolt and the threaded member being substantially the length of the socket from the face of the concrete, whereby the bolt can be lifted into the socket With its free end in contact With the mold upon Which the concrete is to be formed, said bolt and member being adapted to drop by gravity to project the bolt from the socket when the mold is removed.

ln a device of the character described, an open topped socket having a Wall adapted to be placed flush With a face of the concrete, said Wall having an opening through which a bolt can project from the interior of the socket, an interlocking cover for the top of the socket, said socket adapted to contain a non-rotatable nut to receive the bolt and deep enough to permit the bolt to be pushed into the socket until the outer end of the bolt is flush with the outer face of said Wall.

EUGENE T. MARTIN. 

